Updated build.gradle to allow mantis-common-serde to be compiled using JDK 17

[Adithya2907]

Context

Upgrade JDK version to 17. This PR upgrades the mantis-common-serde module.
Part of #355

• When using JDK 17, the gradle build process fails since spotlessJava fails. This is because google-java-format is broken on JDK 16+, and we use this package indirectly while formatting the code.
• The reason for the error is because a few packages that google-java-format uses are not exported by the JDK from JDK 16 onwards.
• A work around for this has been proposed here which I've implemented on the build.gradle file.
• Since this workaround specifically targets JDK 16+, the build process fails when compiling the whole project using JDK 8, when we run ./gradlew build. Therefore, to ensure the flags are added only when target is JDK 17, if(JavaVersion.current() != JavaVersion.VERSION_1_8) has been created inside of which we add the required workaround flags.

Screenshot of successful building of mantis-common-serde module using JDK 17

Checklist

• ./gradlew build compiles code correctly
• Added new tests where applicable
• ./gradlew test passes all tests
• Extended README or added javadocs where applicable